The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 1996
Filed:
Dec. 19, 1994
Gregory R Miller, Chesterfield, MO (US);
Kyle Adriance, St. Charles, MO (US);
Stanley Philipak, St. Charles, MO (US);
Nellcor Puritan-Bennett Incorporated, St. Charles, MO (US);
Abstract
A pre-filter for an oxygen concentrator having enhanced filtering area. The pre-filter is positioned so that air entering the concentrator's air compressor is filtered to removed particulate contaminants. The pre-filter has an impermeable housing consisting of four walls in a rectangular configuration. There is, within the housing, a first filter pledget of porous filter material and second filter pledget of porous filter material with an air space in-between the pledgets. Each pledget has an exposed filtering surface and a material thickness of porous filter material. The opening of a conduit tube that is in fluid communication with the air compressor is positioned in the air space between the filter pledgets. Air entering the conduit tube passes through one of the exposed filtering surfaces and one material thickness of porous filter material.